Timing issue may be (probably is) that NU has to have a publicly posted position available for EEO reasons. I believe the required length is ONE WEEK. So, if that is correct, they couldn't name a coach if they wanted to for at least a week from firing Bo. That might be why they were quick to get it done.
In the past, certain schools would 'post' notice of the job. But to get to it, you had to swim through a 300 yard gasoline-filled pool of alligators in the third basement of the condemned, abandoned building somewhere in the old campus from the 1800's to view it. This practice ended when 'some' people (likely competing schools) got tired of it and complained.
In any case, I hope we make a good hire. I'd be happy with a frog or a vest to lead and a frost-monster in waiting. A Harbaugh would be great, but I would always be a little worried about the NFL, no matter how much we paid. Pro teams are in another financial world.